摘要
铁尾矿是铁矿石经过选别工艺流程过程产生的废物,是数量大、利用率较低的二次资源。由于相关规范要求抗压回弹模量、劈裂试验养护周期较长,在设计周期内试验不能达到规范要求,因此本文以高温养护作为快速提升强度的手段,对水泥稳定铁尾矿进行试验研究,找出高温养护条件下水泥稳定铁尾矿的劈裂强度和抗压回弹模量随养护龄期的增长规律,结果表明:水泥稳定铁尾矿劈裂强度和抗压回弹模量在养护14天前增长迅速,其增长率分别为170. 29%和247. 62%,在此之后增长缓慢,其增长率分别为13. 26%和1. 37%。通过对数函数法、幂函数法和S型曲线法对高温养护水泥稳定铁尾矿强度随龄期的增长规律回归分析,劈裂强度、抗压回弹模量分别以S型曲线法、对数函数法拟合效果最好,达到标准养护龄期90d强度值时的高温养护龄期分别为6天、12天。
Iron tailings are the waste generated from the process of iron ore sorting and selection,it is a secondary resource with large quantity and low utilization rate.As the relevant specifications require compressive resilience modulus,splitting test curing period longer,the test can not meet the specification requirements during the design cycle.Therefore,in this paper,high-temperature curing as a means to quickly improve the strength of cement stabilized iron tailings experimental study.Find out the law of splitting strength and compressive springback modulus of cement-stabilized iron tailings with curing age under high temperature curing conditions.The results show:The splitting strength and compressive resilience modulus of cement-stabilized iron tailings increased rapidly 14 days before curing,their growth rates were 170.29%and 247.62%respectively,after this growth slow,their growth rates were 13.26%and 1.37%respectively.Through the logarithmic function method,power function method and S-curve method,the regression analysis of the regularity of the strength of stabilized iron tailings of high-temperature curing cement with age,the splitting strength is best fitted by the S-curve method,and the compressive resilience modulus is best fitted by the logarithmic function method,when reaching the standard curing period of 90 d,the high temperature curing period is about 6 days and 12 days respectively.
作者
仉健
王奥运
黄前龙
赵敏
Jian Zhang;Aoyun Wang;Qianlong Huang;Min Zhao(School of civil Engineering,Hebei University of Architecture.Zhangjiakou 075000,China;Hebei Key Laboratory for Diagnosis,Reconstruction and Anti - disaster of Civil Engineering,Zhangiakou 075000,China)
出处
《青海交通科技》
2018年第4期116-119,共4页
Qinghai Transportation Science and Technology
关键词
铁尾矿
高温养护
劈裂强度
抗压回弹模量
回归分析
iron tailings
high temperature curing
splitting strength
compressive resilience modulus
regression analysis
